Turbo-generator construction.



C H. S DOT.

TURBO-GENERATOR CONSTRUCTION.

APPLICATION FILED JAN. 2, 1900 Patented Aug. 16. 1910.

UNITED STATES PATENT OFFICE.

' CHARLES H. SMOOT, OF CHICAGO, ILLINOIS, ASSIGNOR, BY MESNE ASSIGNMENTS, TO'

GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

TURBO-GENERATOR CONSTRUCTION.

Specification of Letters Patent.

Patented Aug. 16, 1910.

Application filed January 2, 1906. Serial No. 294,044.

Snoor,

I field type of alternator is driven at a very high speed. 7

The object of my invention is to provide a strong and compact structure possessing the solidity requisite to withstand the enormous centrifugal force to which such rotors are subjected.

In my invention the conductors are em bedded in the cylindrical core of the rotary member. Annular members, preferably disks, at each end of the core serve to interconnect the conductors, and also act as retaining pieces for the ends of the some, said conductors being held in place throughout their entire. length, embedded 111 said core and annular members. My invention thus provides a structure in which the conductors are completely buried in a rotary member which presents the externalappearance of a simple cylinder. The conductors are thus securely held in place, and injury thereto from centrifugal force effectually prevented.

The use of end disks in armature construction is old, such disks being used merely to interconnect the condudtors. Such structures were not designed, however, for-high speed electric machines, and the additional important result secured by my invention, namely, the holding of the conductors in place throughout their entire lengths was not attaine I will describe my invention more particularly by reference to the accompanying drawings, in which, i i

Figure 1 is a side elevation of a rotor embodying my invention; Fig. 2 is a fragmentary longitudinal section thereof; Fig. 3 is a fragmentary cross section on the line 3-3 of Fig. 2; and Fig. 4. IS a simplified dia I which may be employed. and, for sake of clearness, showing a winding in which only one conductor is placed in each slot.

ram illustrating a method of winding Similar letters of reference refer'to similar parts throughout the several views.

Upon the shaft A of the rotary member is mounted a core B. The conductors C of the field windin are embedded in this core near its surface, thereof in slots of a size to receive said conductors. Said core is of a well known construct-ion, being built 11 of a series of soft iron lamina: or disks. Each disk is provided with an arc-shaped row of slots 0 on opposite sides of its axis, said disks being arranged with their corresponding slots in 'exteilding longitudinallyj alinement. There may be one or more conductors in each slot, as may be. deemed desirable.

For purpose of illustration, Ihave shown radial slots extending longitudinally of the cylindrical core, near the surface thereof,

and three conductors arranged in each slot.

I do not limit myself, however, to any particular form of slot, or any particular method of securing the conductors beneath the surface of the cylinder.

At each end of the cylindrical core B are a number of disks D, insulated from the core and from each other. All of these disks, except the two at the extreme ends of the rotor, are provided with slots registering with the slots in the core,- for the purpose of receiving such'of the conductors as may extend therethrough. Each conductor is insulated from all the disks except the one at each end to which it. is riveted or otherwise secured. I preferably rivet the end ofthe conductors to the plates,,since such construction provides a close joint, approximating an integral union, offering no mcreased resistance at this point. As shown in the drawings,

electrical connection is made from one conductor to the next through a diskv D, the conductors being thus arranged in series with each other. The two disks constituting the terminals of the series are in turn electrically corinected to the collector rings E, E, through which current is directed to the windings in the usual manner.

Where a plurality of conductors are arranged in each slot of the core, the radially innermost conductor is connected to a disk which is outside the end conductornd sk or disks of'the other conductor or conductors in that slot. This is shown most clearly in Fig. 2. This method of connection'adds to great strength may be used where deemed enormous force to which it is subjected in inatically in Fig. 4 is that more fully de the strength of the structure, and, in view of the fact that the rotor is especially designed for extremely high speeds, is'a desirable feature of my invention. With this structure the longer ends of the conductors are in the position of the least centrifugal action and have the greatest thickness of outerlying disk support. The material of the disk lying between the point of riveting of a conductor and the surface of the cylinder is sufiicient to prevent the centrifugal force from tearing it out. If the reverse method of connection were used, each of the inner conductors would be riveted to its disk immediately below the slot through which he other conductors passed, and hence an inner conductor under the influence of-the use, would be likely to tear out the thin portions of the disk lying between its riveted end and the slot in its ihonnecting disk, or otherwise injure the joint. Moreover, the method of connection devised by me makes it easier to rivet the conductors to the disks.

While I preferably employ bronze end connector disks, steel disks which possess desirable.

The form of winding illustrated diagramscribed and claimed in a patent to said Hjalmar Hertz, No. 908,098, dated December 29, 1908. In such Winding there will necessarily be one more horizontal conductor on one side of the axis of the winding than on the other, due to the fact that the terminals are brought out at opposite ends of the rotor. As indicated at Fig. 4, a

dummy conductor h is provided on that side eemee of the axis which has the fewer number of lengths of the actual winding.

In the drawings I have shown a form of structure in which I preferably embody my invention, some of the features of said rotor Y being no part of my present invention, but

forming the subject matter of a joint pateacln'radially inner conductor being connect ed to a disk which is outside the end connector disk of the radially outer conductors in the same slot.

i 2. In a rotor for a dynamo-electricvmachine, the combination with a cylindrical core having a group of insulated conductors extending longitudinally of the core in a radial slot therein, of end disks for interconnecting said conductors, the radially innermost conductors being connected to the outermost disks respectively, said disks be ing each provided with a slot corresponding in size to the conductor or conductors passing through the same.

In witness whereof, I, hereunto subscribe my name this 26th day of December A, D.,

CHARLES H. SMOOT. Witnesses:

HJALMAR Hnn'rz, GEORGE E. FOLK. 

